题目选项分析

Headway is now targeted at a wider readership - to include all NUT members who are on the leadership salary spine. This year's NUT membership credential gave members the opportunity to identify themselves as teachers on the leadership spine and Headway will, in future, be mailed directly to all members so identified.

From the text above, which of the following can we reasonably conclude?

【选项】Teachers cannot get access to Headway unless it is mailed to them